2507995561 has 4 divisors (see below), whose sum is σ = 2508394500. Its totient is φ = 2507596624.

The previous prime is 2507995559. The next prime is 2507995579. The reversal of 2507995561 is 1655997052.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 757075225 + 1750920336 = 27515^2 + 41844^2 .

It is a cyclic number.

It is not a de Polignac number, because 2507995561 - 2¹ = 2507995559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2507995961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189886 + ... + 202663.

It is an arithmetic number, because the mean of its divisors is an integer number (627098625).

Almost surely, 2^2507995561 is an apocalyptic number.

It is an amenable number.

2507995561 is a deficient number, since it is larger than the sum of its proper divisors (398939).

2507995561 is an equidigital number, since it uses as much as digits as its factorization.

2507995561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398938.

The product of its (nonzero) digits is 850500, while the sum is 49.

The square root of 2507995561 is about 50079.8917830300. The cubic root of 2507995561 is about 1358.6541546523.

The spelling of 2507995561 in words is "two billion, five hundred seven million, nine hundred ninety-five thousand, five hundred sixty-one".